He's an interesting player. On one hand, I really like how he runs the floor and how he can post up and score. On the other hand, it drives me insane that he is such a poor rebounder. The defense thing, I think will improve with time.
I'd love to see the Celtics start running more. Think of the following lineup: Rondo, Ray, Pierce, Green, Murphy.
Murphy to rebound, outlet, and be a trailer on the break. Ray, trailer on the break. Pierce and Green filling the lanes, Rondo running the break. I'd hate to have to defend that group.